# how do i set data into session and use session data in my request
**URL:** https://community.gatling.io/t/how-do-i-set-data-into-session-and-use-session-data-in-my-request/1686
**Category:** Gatling (Open-Source)
**Created:** [November 13, 2014, 9:26am UTC](https://community.gatling.io/t/how-do-i-set-data-into-session-and-use-session-data-in-my-request/1686 "2014-11-13T09:26:00Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Raja\_Thumati](https://community.gatling.io/u/Raja_Thumati)
#### Post date: [November 13, 2014, 9:26am UTC](https://community.gatling.io/t/how-do-i-set-data-into-session-and-use-session-data-in-my-request/1686/1 "2014-11-13T09:26:00Z")
Hi Stephene,
help me please,
i have some lines of code which is useful to store some data into session,
but i am unable to store data into session,
and based on the session data,i request for some other data through url like bellow (in request processing there i am using session data) ,
val dataVo=voMethod.getVos()val compData=new HashMapList[String],List[String]
compData.put(dataVo.get(0),dataVo.get(1))
val dataKey=100
val scn2=scenario("").exec(session =\> {
import io.gatling.http.cookie.\_
import java.net.URI
val newSession = (session(“gatling.http.cookies”).asOption[CookieJar].flatMap { cookieJar =\>
val cookie = cookieJar.get(URI.create("[")).find(\_.getName == compData)
**cookie.map(session.set(“Key”+dataKey,com\*\*\*\*pData)) ------------------------------------------------------------------------------------------i am getting error here while set data into session**
}).getOrElse(session)
newSession
})
val httpProtocol = http
.baseURL(“url”)
.disableFollowRedirect
.acceptHeader(“text/html,application/xhtml+xml,application/xml;q=0.9,_/_;q=0.8”)
.doNotTrackHeader(“1”)
.acceptLanguageHeader(“en-US,en;q=0.5”)
.userAgentHeader(“Mozilla/5.0 (Windows NT 6.1; rv:32.0) Gecko/20100101 Firefox/32.0”)
.disableResponseChunksDiscarding
.connection(“keep-alive”)
val scn = scenario(“scenario”)
.exec(http(“GETdata”)
.get(dataKey+“geturl”))
setUp(scn.inject(atOnce(1 user))).protocols(httpProtocol)
---
### Author:  [@jarrowwx](https://community.gatling.io/u/jarrowwx)
#### Post date: [November 13, 2014, 3:51pm UTC](https://community.gatling.io/t/how-do-i-set-data-into-session-and-use-session-data-in-my-request/1686/2 "2014-11-13T15:51:05Z")
Your code won’t work. You can’t do the session.set() inside of the cookie map. Not like that, anyway.
Instead, you need to define a “var newSession = session” and where you do the assignment, do “newSession = newSession.set( … )” and at the end, return newSession.
The reason is that a session is immutable. When you call .set() it is returning a new object. Calling set over and over is creating many new objects, rather than doing what you want, which is adding many things to the one session object.